<html>
  <head>
    <title>City Explorer</title>
  </head>
  <body>
    Welcome to the City Explorer. Please choose one of the following cities:
    <ul>
      <% @cities.each do |city_id, city_details| %>
        <li><a href="/city/<%= city_id %>"><%= h city_details[:name] %></a></li>
      <% end %>
    </ul>
  </body>
</html>